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555*554555-554*555554
=(554+1)*554555-554*555554
=554*554555-554*555554+554555
=554*(554555-555554)+554555
=554*(-999)+554555
=554*(1-1000)+554555
=554-554*1000+554555
=554-554000+554555
=554+555
=1109
=(554+1)*554555-554*555554
=554*554555-554*555554+554555
=554*(554555-555554)+554555
=554*(-999)+554555
=554*(1-1000)+554555
=554-554*1000+554555
=554-554000+554555
=554+555
=1109
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555x(554000+555)-554x(555000+554)
=555x554x1000+555²-554x555x1000-554²
=555²-554²
=(555+554)(555-554)
=1109
=555x554x1000+555²-554x555x1000-554²
=555²-554²
=(555+554)(555-554)
=1109
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原式=(554+1)*554555-554*(554555+999)=554555-554*999=554555-554*(1000-1)=554555-554000+554=1109
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